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Newton's Second Law of Motion

Question

A moving body of mass m and velocity v after colliding from a wall returns back (rebounds) with velocity v. The change in momentum will be

A

$$2 \,mv$$

B

zero

C

$$mv$$

D

$$-mv$$

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Solution

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Correct option is A. $$2 \,mv$$
$$∆P=P_i-P_f$$
$$∆P=mv-m(-v)$$
$$∆P=2mv$$

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